a-a a-b a-t aaa aab aaf aan aao aar aat aay ab- aba abb abf abn abo abr abt aby af- afa afb aff afn afo afr aft afy an- ana anb anf ann ano anr ant any aoa aob aof aon aoo aor aot ar- ara arb arf arn aro arr art ary at- ata atb atf atn ato atr att ay- aya ayf ayn ayo ayr ayt baa bab baf ban bao bar bat bay bba bbb bbf bbn bbo bbr bbt bby bfa bfb bff bfn bfo bfr bft bfy bna bnb bnf bnn bno bnr bnt boa bob bof bon boo bor bot boy bra brb brf brn bro brr brt bry bta btb btf btn bto btr btt bty by- bya byf byn byo byr byt faa fab faf fan fao far fat fay fba fbb fbf fbn fbo fbr fbt ffa fff ffn ffo ffr fft ffy fna fnb fnf fnn fnr fnt foa fob fof fon foo for fot foy fra frb frf frn fro frr frt fry fta ftb ftf ftn fto ftr ftt fty fy- fya fyb fyn fyo naa nab naf nan nao nar nat nay nba nbb nbf nbn nbo nbr nbt nfa nfb nff nfn nfo nfr nft nna nnb nnf nnn nno nnt no- noa nob nof non noo nor not noy nra nrb nrf nrn nro nrr nrt nry nta ntb ntf ntn nto ntr ntt nya nyf nyn nyo nyt nyy oaa oab oaf oan oao oar oat ob- oba obb obf obn obo obr obt oby of- ofa ofb off ofn ofo ofr oft on- ona onb onf onn ono onr ont ony oo- ooa oob oof oon ooo oor oot or- ora orb orf orn oro orr ort ory ot- ota otb otf otn oto otr ott oya oyo ra- raa rab raf ran rao rar rat ray rba rbb rbf rbn rbo rbr rbt rfa rfb rff rfn rfo rfr rft rna rnb rnn rno rnr rnt rny roa rob rof ron roo ror rot roy rra rrb rrf rrn rrr rrt rta rtb rtf rtn rto rtr rtt rty ry- rya ryf ryn ryo ryr ryy taa tab taf tan tao tar tat tay tba tbb tbf tbn tbo tbr tbt tfa tfb tff tfn tfo tfr tft tna tnb tnf tnn tno tnr tnt to- toa tob tof ton too tor tot toy tra trb trf trn tro trr trt try tta ttb ttf ttn tto ttr ttt tty tya tyf tyn tyo tyr tyt yaa yab yaf yan yao yar yat yay ybf ybr yby yfa yff yfr yft yna ynn yny yob yof yon yoo yor yot yoy yra yrf yrn yro yrt yta ytf ytn yto ytr ytt yyb yyf yyt yyy